In physics, the force between contacting surfaces that resists motion — friction (e.g., frictional force, coefficient of friction).
摩擦力は物体の運動を妨げる重要な要素だ。
Frictional force is an important factor that resists the motion of objects.
路面の摩擦係数が低いと車は滑りやすくなる。
When the coefficient of friction of the road surface is low, cars are more likely to skid.
ブレーキパッドの摩擦で熱が発生する。
Heat is generated by the friction of the brake pads.
Rubbing or chafing — the action or result of surfaces rubbing against each other, causing wear or irritation.
新しい靴で足が摩擦して靴擦れができた。
My feet were chafed by the new shoes and I got blisters.
長時間の摩擦で布が薄くなってしまった。
After prolonged rubbing, the fabric became thin.
肌の摩擦を減らすためにクリームを塗った。
I applied cream to reduce skin chafing.
Interpersonal or intergroup friction — discord, conflict, or tension between people or groups.
部署間の摩擦がプロジェクトの進行を遅らせている。
Friction between departments is delaying the project's progress.
彼らの間には意見の摩擦があり、会議はかみ合わなかった。
There was friction between them over opinions, and the meeting didn't align.
国境問題をめぐって両国の間に摩擦が生じた。
Friction arose between the two countries over the border issue.